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Biomedical subjects

J E Field

Publications and source records attributed to J E Field.

8 recordsLinked to original sources
PubMed2003

Public-private partnerships in healthcare: the managers' perspective.

The role of the private sector in the provision of publicly funded healthcare services has become the subject of increasing debate and discussion at the heart of the New Labour Government. The present paper reports the findings from an empirical study regarding the attitude of public-sector managers towards public-private partnerships in the healthcare arena. It reveals a growing awareness amongst managers of both the positive and negative consequences of stepping into the market place to purchase services. However, in the context of the ongoing ideological debate within the Government regarding the role of both the private sector and markets within healthcare, public sector managers are unlikely to receive the practical advice that will enable them to reap the benefits of working with the private sector and avoid the pitfalls.

Attitude to Health↗
PubMed2002

Construction of a high-resolution moiré interferometer for investigating microstructural displacement fields in materials.

A high-magnification moiré interferometer has been constructed with a spatial resolution of the order of 1 microm to measure the local in-plane displacement field associated with a material's microstructure. Laser illumination passes through phase-stepping optics and is delivered to the microscope head by polarization-preserving single-mode optical fibres. The head itself is a compact unit consisting of collimating optics, an objective lens and a charge coupled device (CCD) camera. Thin-phase gratings are cast onto the sample surface with a compliant epoxy resin and coated with ca. 5 nm of gold to enhance the fringe contrast and reduce speckle noise. By switching between the laser illumination and white-light illumination, the underlying microstructure is viewed in exact registration with the measured displacement fields. The application of the instrument is illustrated here by visualization of displacement fields in polymer-bonded explosives (PBXs) during deformation to failure. PBXs are highly filled polymers consisting of up to 95% by weight crystalline explosive bound in a variety of polymeric binders. The mechanical properties of PBXs are highly dependent on the microstructure, and moiré interferometry is an ideal tool for investigating the relationship between the 1-100 microm sized crystals and the displacement fields. Methods such as this are required if computer models of inhomogeneous materials are to be accurately validated.

Azocines↗
PubMed1999

Perceptual-motor sequence learning of general regularities and specific sequences.

Participants viewed digit strings and typed them on a computer keyboard. When they used the same key configuration across training and test, they typed test strings that adhered to the same sequence rule as training strings faster than test strings that adhered to the opposite rule (general-regularity [GR] learning), and they typed test strings that were processed repeatedly during training faster than test strings that were not (specific-sequence [SS] learning). However, when they used different key configurations at training and at test, GR learning, but not SS learning, was observed. Conversely, when they did not type but spoke the strings aloud during training, SS learning, but not GR learning, was observed. Results suggest that in addition to declarative memory for specific sequences, relatively independent subsystems underlie procedural learning of perceptual-motor sequence components (producing GR effects) and sequence wholes (producing SS effects).

Female↗
PubMed1999

The relationship between skill learning and repetition priming: experimental and computational analyses.

Skill learning and repetition priming are considered by some to be supported by separate memory systems. The authors examined the relationship between skill learning and priming in 3 experiments using a digit entering task, in which participants were presented with unique and repeated 5-digit strings with controlled sequential structure. Both skill learning and priming were observed across a wide range of skill levels. Performance reflected the effects of learning at 3 different levels of stimulus structure, calling into question a binary dichotomy between item-specific priming and general skill learning. Two computational models were developed which demonstrated that previous dissociations between skill learning and priming can occur within a single memory system. The experimental and computational results are interpreted as suggesting that skill learning and priming should be viewed as 2 aspects of a single incremental learning mechanism.

Adult↗
PubMed1991

The physics of liquid impact, shock wave interactions with cavities, and the implications to shock wave lithotripsy.

This paper reviews research on the physics of liquid impact and the behaviour of cavities when a shock passes over them. It is shown that the problems are related since when a cavity collapses near a solid surface, or is collapsed by a shock wave, the collapse is asymmetric and a liquid jet is produced which can impact an adjacent solid. The implications of this research to shock wave lithotripsy are emphasized. Finally, the paper describes the development of a device, based on liquid jet impact, for fragmenting kidney stones.

Humans↗
PubMed1991

Volatile synthetic organics in mothers' milk.

Human breast milk samples from eight southeast Louisiana communities and one in Mississippi were analyzed by the purge and trap plus gas chromatography method for trihalomethane compounds (THMs). THM levels in drinking water samples from the same communities were compared but analysis of variance computations showed no significant correlation between the water and breast milk. THMs do not appear to be extracted from drinking water to concentrate in human breast milk.

Analysis of Variance↗